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research article

New method for measuring compressibility and poroelasticity coefficients in porous and permeable rocks

Pimienta, Lucas Xan  
•
Fortin, Jerome
•
Gueguen, Yves
2017
Journal of Geophysical Research: Solid Earth

Over the last decades, a large understanding has been gained on the elastic properties of rocks. Rocks are, however, porous materials, which properties depend on both response of the bulk material and of the pores. Because in that case both the applied external pressure and the fluid pressure play a role, different poroelasticity coefficients exist. While theoretical relations exist, measuring precisely those different coefficients remains an experimental challenge. Accounting for the different experimental complexities, a new methodology is designed that allows attaining accurately a large set of compressibility and poroelasticity coefficients in porous and permeable rocks. This new method relies on the use of forced confining or pore fluid pressure oscillations. In total, seven independent coefficients have been measured using three different boundary conditions. Because the usual theories predict only four independent coefficients, this overdetermined set of data can be checked against existing thermodynamic relations. Measurements have been performed on a Bentheim sandstone under, water-and glycerine-saturated conditions for different values of confining and pore fluid pressure. Consistently with the poroelasticity theory, the effect of the fluid bulk modulus is observed under undrained conditions but not under drained ones. Using thermodynamic relations, (i) the unjacketed, quartz, and skeleton (Zimmerman's relation) bulk moduli fit, (ii) the drained and undrained properties fit, and (iii) it is directly inferred from the measurements that the pore skeleton compressibility C-phi is expected to be constant with pressure and to be exceedingly near the bulk skeleton C-s and mineral C-m compressibility coefficients. Plain Language Summary Poroelastic properties of rocks are a major information for a large variety of applications linked to rupture processes in saturated media. Theories exist to link the properties to measurable parameters. Yet only little measurements exist to confront those theories. This article aims at providing a method for accurately measuring those properties. Moreover, for one particular rock, a large amount of compressibility and poroelastic coefficients is measured and used to confront those theories.

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Type
research article
DOI
10.1002/2016Jb013791
Web of Science ID

WOS:000401867200012

Author(s)
Pimienta, Lucas Xan  
Fortin, Jerome
Gueguen, Yves
Date Issued

2017

Publisher

Amer Geophysical Union

Published in
Journal of Geophysical Research: Solid Earth
Volume

122

Issue

4

Start page

2670

End page

2689

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LEMR  
Available on Infoscience
July 10, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/139162
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